Improvement in brushes for boiler - flues



UNITED STATES PATENT OFFICEe CHARLES H. BUSH, OF FALL RIV-ER, MASSACHUSETTS.

Specification forming part of Letters Patent No. 55,815, dated June 26,1866.

To all whom it may concern.'

Be it known that I7 CHARLES H. BUSH, of Fall River, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvementona Flue-Brush for Clearing Scot and other Substances from the Flues of Steam-Boilers; and I do hereby declare that the following is a full. and exact description thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention consists in an expansive and contracting brusha brush separated inthe center and provided with springs, so that it Will adjust itself to the variations of the diameters ofthe tlues when reciprocated through them.

The drawing is a perspective vieu7 of my invention.

A A A A are halves of the brushes. B B are shafts, to which A A, 85o., are firmly secured; C C C C, elliptic spring fastened to B B. E is an adjusting-screw playing loose in the upper shaft, B, by which the two halves of the brush may be adjusted to enter the tlue. Z Z sho7 the Vopening when the parts of the brush are separated.

Operation: Thetlue-brush bein gconstructed as herein described, with elliptic spring and adj Listing-screw, as shown, and adjusted to enter a ue, its operation and novelty' may be noted.

By reciprocating the brush through the iiue the spring permits it to contractor expand Where the diameter of the Hue is contracted or expanded, and thereby causes the brush to fcllow the uneven surface ot' the ue and remove the obstructions from it. V

I do not confine myselfto any particular form or size of brush, or form ofspring, orto the form set forth for vadjusting the brush for entering a iue. It may be constructed in any practical form or size, and adjusted to enter a nue by any practical device. Neither do I claim any device previously invented or patented for clearing nues; but

What I do claim as my invention, and desire to secure by Letters Patent, is-

An expanding and contracting brush for clearing obstructions from the tlues of steamboilers, constructed and operating as herein set forth and described. CHAS. H. BUSH.

Witnesses:

GEORGE A. Hicxs, B. F. WINsLoW. 

